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Patent

Data certification method and apparatus

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TLDR
In this paper, an apparatus and method for signing electronic data with a digital signature in which a central server comprises a signature server (110) and a authentication server (120) is described.
Abstract
An apparatus and method for signing electronic data with a digital signature in which a central server comprises a signature server (110) and a authentication server (120). The signature server (110) securely stores the private cryptographic keys of a number of users (102). The user (102) contacts the central server using a workstation (101) through a secure tunnel which is set up for the purpose. The user (102) supplies a password or other token (190), based on information previously supplied to the user by the authentication server (120) through a separate authentication channel. The authentication server provides the signature server with a derived version of the same information through a permanent secure tunnel between the servers, which is compared with the one supplied by the user (102). If they match, data received from the user (102) is signed with the user's private key.

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Citations
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References
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Journal ArticleDOI

A method for obtaining digital signatures and public-key cryptosystems

TL;DR: An encryption method is presented with the novel property that publicly revealing an encryption key does not thereby reveal the corresponding decryption key.
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System and method for electronic transmission, storage and retrieval of authenticated documents

TL;DR: In this paper, the authors address the interoperability problem between PKI and CA from a different point of view, with a focus on establishing a trust environment suitable for the creation, execution, maintenance, transfer, retrieval and destruction of electronic original information objects that may also be transferable records.
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System and method for electronic transmission, storage, and retrieval of authenticated electronic original documents

TL;DR: In this paper, the authors provided methods of handling stored electronic original objects that have been created by signing information objects by respective transfer agents, submitting signed information objects to a trusted custodial utility, and validating the submitted signed objects by at least testing the integrity of the contents of each signed information object and the validity of the signature of the respective transfer agent.
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Method and apparatus for protecting the confidentiality of passwords in a distributed data processing system

TL;DR: In this article, the authors proposed a login protocol that enables remote authentication of a user's password without transmitting the password over the network, but the login agent is not trusted with the user's passwords and is therefore a "semi-trusted" node.